docstr: test that dct(somevector) is computed correctly 
docstr_tok: ["test","that","dct","(","somevector",")","is","computed","correctly"]
code: def test_some_ones(self):
      """test that dct(somevector) is computed correctly"""
      a_dct = aubio.dct(16)
      a_in = np.ones(16).astype(aubio.float_type)
      a_in[1] = 0
      a_in[3] = np.pi
      a_expected = aubio.fvec(precomputed_some_ones)
      assert_almost_equal(a_dct(a_in), a_expected, decimal=6)
  
file_path: aubio/python/tests/test_dct.py
imports: import numpy
  from numpy.testing import TestCase, assert_almost_equal
  import aubio
label_desc: Use image node_id 3 for calling the aubio_dct obj's underlying member method code with example usage: obj.test_some_ones() without return types